Can someone tell me what I need and what to do, to check engine compression? What figures Do I need to look for?

1st car is a 98 Civic Si (US EX model)
2nd car is a 99 Civic CX

Both stock engines.

Thanks

 

- Get a screw-in type compression tester
- remove all of your spark plugs
- find/remove the fuse for your fuel pump or just unplug your fuel pump connector under the seat
- screw in the tester into the cylinder you're going to test
- turn over the engine until the compression doesn't raise anymore
- take note of what the test results are
- move to the next cylinder and repeat the steps above

I don't know what the compression should be. Sorry.

 

also take not of how many cranks it takes to build to that pressure. you should have your max reading within about 3 cranks.

 

If I'm not mistaken compression should be tested with the TB wide open so you should have the person cranking hold the accelerator down.

 

I'm pretty sure the compression should be around 140-150 but I'm not positive about this. that is just what my engine is (d16y7 with 110k)
Also you should disable the ignition system by unpluging the electrical plug on the distributor

I think you are supposed to crank it 6-7 times

 

right but compression should level out at about 3 cranks.

 

why would it matter how many cranks it takes? if you think about it, shouldn't you really only turn it once because you only have one compression stroke per cylinder per cycle? h: :chuckles:

 

he has got a point but the c-speed how to says to crank each cylinder 5 times.

 

Couldn't get the stupid spark plug adaptor in tight. I just got one of those 20$ gauges with a rubber hose and an adapter. I guess I will try again. And I will make sure to have the engine hot and hold down the accelerator pedal.

Can I hook up the gauge, then go to the car and crank the engine, then comeback and read the gauge? Or do I need someone cranking the engine while I look at the gauge?

 

need somebody to look at it...cause when the exhaust valves open up then the compression will be released.